function action(form,campo,atrib) {
	alert("Campo " + campo + " " + atrib + "!");
	form.elements[campo].style.border = "1px dotted #f00";
	form.elements[campo].focus();
	return false;
}
function valida(form) {
	var id = new Array("nome","email","interesse");
	for (i=0; i <= id.length-1; i++) {
		if (form.elements[id[i]].value == "")
			return action(form,[id[i]],"obrigatório");
		if ([id[i]] == "email") {
			valido = /^[a-zA-Z0-9][a-zA-Z0-9\._-]+@([a-zA-Z0-9\._-]+\.)[a-zA-Z-0-9]{2}/;
			if (!valido.exec(form.elements[id[i]].value))
				return action(form,[id[i]],"inválido");
		}
	}
}